how many say, "i've never looked any further than just around my local--" come on, come on, okay? and there's another thing too. you guys don't be knowing about- distant, distant mountains that are covered with show that are very, very bright, far, far away, don't look white. they look, kind of, yellowish. like, some of the blue didn't make it to your eye. i wonder how come distant bright things look yellowish, and distant dark things look bluish? in fact, when you look up at the sky, it's all blue. guess what the background is, the darkness of outer space. the astronauts get up. they're looking down to the same sky. they're looking straight down. here's the globe right here. did they see the blue? no. they don't see the blue. what do they see? the color of the earth. we look out, we see blue. they look down and say, "i don't see no blue." they wouldn't say, "i don't see no blue," that means they do see blue, yeah? they see that off at the edge, okay? but what's going on here, gang? think about these ideas. we'll be talking about it again, okay? [music]